Year	%
1997	79.48
2001	79.46
2002	79.46
2003	79.37
2004	79.37
2005	79.37
2006	79.37
2007	79.05
2008	79.05
2009	79.05
2010	79.05
2011	79.05
2013	78.9
2015	79.05
2016	79.05